Place strawberries in a blender; puree until smooth.
Transfer strawberry puree to a saucepan over medium heat; bring to a boil, stirring often, until puree is reduced by at least half, about 20 minutes. Remove from heat and cool completely.
Beat butter with an electric mixer in a bowl until light and fluffy. Then beat 1 cup confectioners' sugar into butter until just blended.
Beat 2 tablespoons strawberry puree and vanilla extract into butter mixture until just blended. Repeat with 1 cup confectioners' sugar, followed by 2 tablespoons strawberry puree two more times.
Beat last 1/2 cup confectioners' sugar into mixture until just blended.
- 1.0c Fresh strawberries
- 1.0c Butter
- 1.0c Sifted confectioners sugar
- 1.0tsp Vanilla extract
- 1/2c Sifted confectioners sugar divided